Patch rtems-rc-20000627-1 from Ralf Corsepius <corsepiu@faw.uni-ulm.de>

that is part of the multilib/gnu-canonicalization movement:

Changes:
  * New m4-macro: aclocal/multilib.am
  * Suppress multiprocessing if --enable-multilib is given to
    configure

Notes:
  For now this patch only suppresses multiprocessing if
  --enable-multilib is given to configure and should not have any
  other side-effects, ie. it works around a minor issue which prevents
  introduction of multilibs in general.

  The RTEMS_ENABLE_MULTILIB_MASTER macro is the core part to build
  real multilibs, but can not be applied before other multilib related
  issues with RTEMS have been solved. (e.g. sptables.h, bsp_specs,
  Cygnus/Gnu canonicalization, _RTEMS_version, targopts.h, changing
  the installation point/tooldir support, etc.).

Makefile.am

@@ -29,7 +29,7 @@ ACLOCAL_FILES += aclocal/ar-s.m4 aclocal/bsp-alias.m4 \
     aclocal/i386-gas-code16.m4 aclocal/path-ksh.m4 aclocal/path-perl.m4 \
     aclocal/prog-cc.m4 aclocal/prog-cxx.m4 aclocal/project-root.m4 \
     aclocal/rtems-top.m4 aclocal/sysv-ipc.m4 aclocal/target.m4 \
-    aclocal/tool-paths.m4 aclocal/tool-prefix.m4
+    aclocal/tool-paths.m4 aclocal/tool-prefix.m4 aclocal/multilib.m4
 
 noinst_SCRIPTS = bootstrap
 

aclocal/check-multiprocessing.m4

@@ -4,6 +4,7 @@ dnl
 
 AC_DEFUN(RTEMS_CHECK_MULTIPROCESSING,
 [dnl
+AC_REQUIRE([RTEMS_ENABLE_MULTILIB])dnl
 AC_REQUIRE([RTEMS_ENV_RTEMSBSP])dnl
 AC_REQUIRE([RTEMS_TOP])dnl
 AC_REQUIRE([RTEMS_CHECK_CPU])dnl
@@ -13,14 +14,20 @@ AC_REQUIRE([RTEMS_BSP_ALIAS])dnl
 AC_CACHE_CHECK([whether BSP supports multiprocessing],
   rtems_cv_HAS_MP,
   [dnl
-    if test -d "$srcdir/${RTEMS_TOPdir}/c/src/lib/libbsp/${RTEMS_CPU}/${RTEMS_BSP_FAMILY}/shmsupp"; then
-      if test "$RTEMS_HAS_MULTIPROCESSING" = "yes"; then
-        rtems_cv_HAS_MP="yes" ;
-      else
-        rtems_cv_HAS_MP="disabled";
-      fi
+    if test x"$multilib" = x"yes"; then
+      # FIXME: Currently, multilibs and multiprocessing can not be 
+      # build simultaneously
+      rtems_cv_HAS_MP="disabled"
     else
-      rtems_cv_HAS_MP="no";
+      if test -d "$srcdir/${RTEMS_TOPdir}/c/src/lib/libbsp/${RTEMS_CPU}/${RTEMS_BSP_FAMILY}/shmsupp"; then
+        if test "$RTEMS_HAS_MULTIPROCESSING" = "yes"; then
+          rtems_cv_HAS_MP="yes" ;
+        else
+          rtems_cv_HAS_MP="disabled";
+        fi
+      else
+        rtems_cv_HAS_MP="no";
+      fi
     fi])
 if test "$rtems_cv_HAS_MP" = "yes"; then
 HAS_MP="yes"

aclocal/multilib.m4

@@ -0,0 +1,59 @@
+dnl This provides configure definitions used for multilib support
+
+dnl parts of these macros are derived from newlib-1.8.2's multilib support
+
+AC_DEFUN(RTEMS_ENABLE_MULTILIB,
+[
+AC_ARG_ENABLE(multilib,
+[  --enable-multilib         build many library versions (default)],
+[case "${enableval}" in
+  yes) multilib=yes ;;
+  no)  multilib=no ;;
+  *)   AC_MSG_ERROR(bad value ${enableval} for multilib option) ;;
+ esac], [multilib=yes])dnl
+
+AM_CONDITIONAL(MULTILIB,test x"${multilib}" = x"yes")
+])
+
+AC_DEFUN(RTEMS_ENABLE_MULTILIB_MASTER,
+[
+AC_REQUIRE([RTEMS_ENABLE_MULTILIB])
+
+dnl We may get other options which we don't document:
+dnl --with-target-subdir, --with-multisrctop, --with-multisubdir
+
+test -z "[$]{with_target_subdir}" && with_target_subdir=.
+
+if test "[$]{srcdir}" = "."; then
+  if test "[$]{with_target_subdir}" != "."; then
+    multilib_basedir="[$]{srcdir}/[$]{with_multisrctop}../ifelse([$2],,,[$2])"
+  else
+    multilib_basedir="[$]{srcdir}/[$]{with_multisrctop}ifelse([$2],,,[$2])"
+  fi
+else
+  multilib_basedir="[$]{srcdir}/ifelse([$2],,,[$2])"
+fi
+AC_SUBST(multilib_basedir)
+
+if test "${multilib}" = "yes"; then
+  multilib_arg="--enable-multilib"
+else
+  multilib_arg=
+fi
+
+AC_OUTPUT_COMMANDS(
+  if test -n "$CONFIG_FILES"; do
+    $ac_file" = ifelse([$1],,Makefile,[$1]) \
+    . ${multilib_basedir}/../config-ml.in
+  fi,
+  srcdir=${srcdir}
+  host=${host}
+  target=${target}
+#  with_multisrctop="${with_multisrctop}"
+#  with_target_subdir="${with_target_subdir}"
+  with_multisubdir="${with_multisubdir}"
+  ac_configure_args="${multilib_arg} ${ac_configure_args}"
+  CONFIG_SHELL=${CONFIG_SHELL-/bin/sh}
+  multilib_basedir=${multilib_basedir}
+  CC="${CC}")
+])